    <div class="refentry" id="glDispatchComputeIndirect">
      <div class="titlepage"></div>
      <div class="refnamediv">
        <h2>Name</h2>
        <p>glDispatchComputeIndirect — launch one or more compute work groups using parameters stored in a buffer</p>
      </div>
      <div class="refsynopsisdiv">
        <h2>C Specification</h2>
        <div class="funcsynopsis">
          <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
            <tr>
              <td>
                <code class="funcdef">void <strong class="fsfunc">glDispatchComputeIndirect</strong>(</code>
              </td>
              <td>GLintptr <var class="pdparam">indirect</var><code>)</code>;</td>
            </tr>
          </table>
          <div class="funcprototype-spacer"> </div>
        </div>
      </div>
      <div class="refsect1" id="parameters">
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>indirect</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    The offset into the buffer object currently bound to the
                    <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code> buffer target at
                    which the dispatch parameters are stored.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p>
            <code class="function">glDispatchComputeIndirect</code> launches one or more compute
            work groups using parameters stored in the buffer object currently bound
            to the <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code> target.
            Each work group is processed by the active program object for the compute
            shader stage. While the individual shader invocations within a work group are
            executed as a unit, work groups are executed completely independently and in
            unspecified order. <em class="parameter"><code>indirect</code></em> contains the offset
            into the data store of the buffer object bound to the <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code>
            target at which the parameters are stored.
        </p>
        <p>
            The parameters addressed by <em class="parameter"><code>indirect</code></em> are packed a structure,
            which takes the form (in C):
            </p>
        <pre class="programlisting">    typedef  struct {
        uint  num_groups_x;
        uint  num_groups_y;
        uint  num_groups_z;
    } DispatchIndirectCommand;</pre>
        <p>
        </p>
        <p>
            A call to <code class="function">glDispatchComputeIndirect</code> is equivalent, assuming no
            errors are generated, to:
            </p>
        <pre class="programlisting">    cmd = (const DispatchIndirectCommand  *)indirect;
    glDispatchComputeIndirect(cmd-&gt;num_groups_x, cmd-&gt;num_groups_y, cmd-&gt;num_groups_z);
    }</pre>
        <p>
        </p>
        <p>
            Unlike <a class="citerefentry" href="glDispatchCompute"><span class="citerefentry"><span class="refentrytitle">glDispatchCompute</span></span></a>,
            no error is generated if any of the <code class="code">num_groups_x</code>,
            <code class="code">num_groups_y</code> or <code class="code">num_groups_z</code> members
            of the <code class="code">DispatchIndirectCommand</code> is larger than the
            value of <code class="constant">GL_MAX_COMPUTE_WORK_GROUP_COUNT</code> for the
            corresponding dimension. In such circumstances, behavior is undefined and
            may lead to application termination.
        </p>
      </div>
      <div class="refsect1" id="errors">
        <h2>Errors</h2>
        <p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if there is no active program
            for the compute shader stage.
        </p>
        <p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>indirect</code></em> is
            less than zero or not a multiple of four.
        </p>
        <p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if no buffer is bound to the
            <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code> target or if the command would
            source data beyond the end of the buffer object's data store.
        </p>
      </div>
      <div class="refsect1" id="associatedgets">
        <h2>Associated Gets</h2>
        <p>
            <a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_COMPUTE_WORK_GROUP_COUNT</code>
        </p>
      </div>
      {$pipelinestall}{$examples}
      <div class="refsect1" id="versions">
        <h2>API Version Support</h2>
        <div class="informaltable">
          <table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
            <colgroup>
              <col style="text-align: left; "/>
              <col style="text-align: center; " class="firstvers"/>
              <col style="text-align: center; "/>
              <col style="text-align: center; " class="lastvers"/>
            </colgroup>
            <thead>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; ">

            </th>
                <th style="text-align: center; border-bottom: 2px solid ; " colspan="3">
                <span class="bold"><strong>OpenGL ES API Version</strong></span>
            </th>
              </tr>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>Function Name</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.0</strong></span>
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.1</strong></span>
            </th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td style="text-align: left; border-right: 2px solid ; ">
                  <code class="function">glDispatchComputeIndirect</code>
                </td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; ">✔</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1" id="seealso">
        <h2>See Also</h2>
        <p>
            <a class="citerefentry" href="glDispatchCompute"><span class="citerefentry"><span class="refentrytitle">glDispatchCompute</span></span></a>.
        </p>
      </div>
      <div class="refsect1" id="Copyright">
        <h2>Copyright</h2>
        <p>
            Copyright © 2012-2014 Khronos Group.
            This material may be distributed subject to the terms and conditions set forth in
            the Open Publication License, v 1.0, 8 June 1999.
            <a class="link" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.
        </p>
      </div>
    </div>
